Jack M. Crazyfish is a big fish that appears in the episode: Blackened Sponge. He's a fish in SpongeBob's dreams, but is actually a real person who lives in Bikini Bottom. SpongeBob gets a black eye from a wrench being stuck in his eye, but makes up a story that he got it from fighting Crazyfish. Crazyfish then comes to the Krusty Krab because he heard that SpongeBob makes great Krabby Patties, and he's hungry for one. He also makes a cameo appearance in 20,000 Patties Under the Sea although he just throws rocks at Plankton. Jack is a fish with a very big body. He wears a brown suit and a yellow shirt underneath. He has a big mustache and a small green top hat on his head. His skin is light purple. He was voiced by Greg Baldwin, who voiced Frank Fontaine and Aku.